CN211335659U - Electrified railway traction power supply system based on hybrid energy storage - Google Patents
Electrified railway traction power supply system based on hybrid energy storage Download PDFInfo
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Abstract
The application discloses an electrified railway traction power supply system based on hybrid energy storage, which comprises a power supply unit, a hybrid energy storage unit and a traction network unit; the hybrid energy storage unit comprises a capacity type energy storage device and a power type energy storage device, wherein the capacity type energy storage device comprises a flow battery, and the flow battery adopts a duplex structure and converts direct current into alternating current; the power type energy storage equipment adopts a lithium battery and a super capacitor, the power supply unit charges the hybrid energy storage unit, and the hybrid energy storage unit supplies power to the traction network unit through a single-phase/three-phase alternating current bus. The hybrid energy storage unit is adopted to collect various clean electric energy such as wind, light and the like, loose coupling of a power grid and a traction network is realized, economic construction and clean power supply of the traction power supply system of the electrified railway in a weak grid area or even a grid-free area are realized, various adverse effects of the conventional traction power supply system on the power grid and the traction network of the electrified railway are solved, and green development of railways in China is led.
Description
Technical Field
The utility model relates to an electric railway pulls power supply system based on mix energy storage belongs to the railway network field.
Background
The electrified railway traffic is an important support for realizing the regional economic integration and the cross-regional economic development synergy of China and solving the imbalance of the social economic development of different regions. However, the existing power grid and the traction power supply system are closely coupled and have large mutual influence, and a plurality of problems exist, specifically as follows:
adverse effect of existing traction power supply system on power grid side
(1) Under the existing traction network and power grid architecture of the electrified railway, other types of power supply electric energy except a high-voltage power grid cannot be utilized.
(2) And a plurality of electric phase separation devices arranged along the traction network have huge investment and high operation and maintenance cost.
(3) The construction of the high-voltage power grid of the electrified railway is complex in supporting facilities, large in engineering investment, long in construction period, large in land occupation and serious in ecological influence.
(4) The electric locomotive is a high-power, asymmetric and pulse single-phase load, which not only seriously affects the electric energy quality (negative sequence, harmonic wave and power factors) of a 220kV/110kV high-voltage power grid, but also increases the peak load regulation pressure of the power grid.
(II) adverse effect of the existing traction power supply system on the side of the railway
(1) The transition of the traction power supply system depends on a grid frame strong high-voltage power grid, so that the construction difficulty and the cost of the electrified railway in the weak areas (such as Sichuan and Qinghai-Tibet areas) of the power grid are high, and the popularization of the railway electrification technology in China is seriously influenced.
(2) The reliability, continuity and safety of the operation of the conventional electric railway traction system completely depend on a power grid system, and once the power grid fails, the operation of an electrified railway is greatly and negatively influenced.
In view of the above, the present inventors have studied this problem and developed a hybrid energy storage based traction power supply system for an electric railway.
Disclosure of Invention
The utility model aims at providing an electric railway pulls power supply system based on mix energy storage adopts multiple clean electric energy such as mixed energy storage unit convergent wind, light, has realized the electric wire netting and has pull the loose coupling of net, has realized that weak net does not have net district electric railway even pulls power supply system's economic construction and clean power supply, has solved current many adverse effects that pull power supply system subsidiary for electric wire netting and electric railway and pull the net.
In order to achieve the above object, the solution of the present invention is:
the electrified railway traction power supply system based on hybrid energy storage comprises a power supply unit, a hybrid energy storage unit and a traction network unit; the hybrid energy storage unit comprises a capacity type energy storage device and a power type energy storage device, wherein the capacity type energy storage device comprises a flow battery, and the flow battery adopts a duplex structure and converts direct current into alternating current; the power type energy storage equipment adopts a lithium battery and a super capacitor, the power supply unit charges the hybrid energy storage unit, and the hybrid energy storage unit supplies power to the traction network unit through a single-phase/three-phase alternating current bus.
Preferably, the flow battery adopts a duplex structure, which specifically comprises: each standardized flow battery is correspondingly provided with one bidirectional DC-DC converter, every two bidirectional DC-DC converters are connected with one DC/AC converter (PCS), and the low-voltage side of each DC/AC converter realizes the exchange of energy with a 27.5kV single-phase/three-phase alternating current bus through a low-voltage winding of a split traction transformer.
Preferably, the lithium battery and the super capacitor are connected with a DC/AC converter (PCS), and the low-voltage side of each DC/AC converter realizes the exchange of energy with a 27.5kV single-phase/three-phase alternating current bus through a low-voltage winding of a split traction transformer.
Preferably, the power supply unit at least comprises one of a distributed wind turbine and a distributed photovoltaic set; the wind-powered wind power generation set and the distributed photovoltaic set form a direct-current micro-grid or an alternating-current micro-grid to charge the hybrid energy storage unit in a cooperative manner.
Preferably, the power supply unit further comprises a third power supply, the third power supply comprises a fuel cell pack, a diesel engine, a small hydroelectric power pack, a 0.4kV power distribution network and/or a 27.5kV high-voltage power grid, and the fuel cell pack is connected with the hydrogen production equipment and generates electric energy through the hydrogen production equipment.
Preferably, when the wind-powered wind power generation unit, the distributed photovoltaic unit and the third power supply form an alternating current microgrid, the traction power supply system for the electrified railway further comprises a step-up transformer, wherein the step-up transformer is used for stepping up the low-voltage alternating current output by the power supply unit to 27.5kV and charging the hybrid energy storage unit through a 27.5kV three-phase alternating current bus.
Preferably, the flow battery comprises an all vanadium flow battery, a zinc bromine flow battery or an iron chromium flow battery.
Preferably, the lithium battery includes a lithium carbonate battery, a lithium iron phosphate battery, or a lithium manganate battery.
The utility model discloses an electrified railway pulls power supply system based on mix energy storage, utilize mix the energy storage unit separation to pull the direct relation of net and electric wire netting, realized the loose coupling of electric wire netting and traction net, eliminated the electric energy quality influences such as negative sequence, harmonic, power factor that current pulls power supply system and bring for the high-voltage electric wire netting; the system gets rid of transitional dependence on a high-voltage power grid, can flexibly form a multi-source heterogeneous energy supply system according to natural endowments of wind, light and the like of an electrified railway construction site and other convenient power supplies, realizes safe, reliable and continuous power supply of a traction power supply network under a weak grid frame or even a grid-free frame by utilizing the technical characteristic of energy transfer of 'full-time convergence and release on demand' of stored energy, and simultaneously solves a plurality of adverse problems of the conventional traction power supply system of the electrified railway. According to the operation state of the hybrid energy storage unit, the traction power supply system can be divided into 3 operation conditions:
(1) storage discharge mode (on demand). When the master control monitors that the power supply arm has the locomotive to pass through and is in a traction state, the plurality of energy storage devices cooperatively output power (if a power distribution network or a high-voltage power grid exists in a power supply system, the power supply arm is disconnected with a connected switch at the moment, the influence on the power quality of the power grid is avoided, and the wind power, photovoltaic or fuel cell and other devices can continuously charge the stored energy), so that the power utilization requirement of the electric locomotive is met.
(2) Energy storage charging mode (full time). When the master control system monitors that the power supply arm inorganic vehicle passes through or runs in an idle state, each power supply of the power supply unit is charged in a low-current equalizing mode for the hybrid energy storage unit; when the master control system monitors that the power supply arm locomotive operates in a braking state, each power supply of the power supply unit (for example, the power supply system comprises a power distribution network or a high-voltage power grid, a connecting switch is disconnected, the power supply unit is in a hot standby state, and the hybrid energy storage unit is not charged) performs low-current equalizing charging on the hybrid energy storage unit, and meanwhile, the hybrid energy storage unit recovers braking energy of the electric locomotive.
(3) Energy storage assisted service mode (according to plan). When the power supply unit component contains a power distribution network or a high-voltage power grid and the power grid needs auxiliary services such as peak regulation, frequency modulation and voltage regulation, the hybrid energy storage unit can intelligently interact with the power grid according to a planned output curve given by the power grid on the premise of meeting the power supply requirement of the locomotive by the traction power supply system, so that the auxiliary services are provided for the power grid.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a topology structure diagram (single phase) of an electrified railway traction power supply system based on hybrid energy storage of embodiment 1;
FIG. 2 is a schematic diagram of a two-stage structure according to embodiment 1;
fig. 3 is a topology structure diagram (three phases of a common dc bus structure) of the traction power supply system of the electric railway based on hybrid energy storage according to embodiment 2;
fig. 4 is a topology structure diagram (three phases of a common ac bus structure) of the traction power supply system of the electric railway based on hybrid energy storage according to embodiment 3.
Detailed Description
Example 1
The embodiment is a single-phase traction power supply system, and an electrified railway traction power supply system based on hybrid energy storage, as shown in fig. 1, includes a power supply unit 1, a hybrid energy storage unit 2, and a traction network unit 2. The power supply unit 1 charges the hybrid energy storage unit 3, and the hybrid energy storage unit 2 supplies power to the traction network unit 3 through a single-phase alternating current bus.
The power supply unit 1 is multi-source heterogeneous and comprises n distributed wind turbine generators 11, n distributed photovoltaic sets 12 and n fuel cell sets 13, wherein the fuel cell sets 13 are connected with hydrogen production equipment 14, and electric energy is generated through the hydrogen production equipment 14. The n distributed wind power generation sets 11, the n sets of distributed photovoltaic sets 12 and the n sets of fuel cell sets 13 form a direct-current micro-grid structure to cooperatively charge the hybrid energy storage unit 2. The power supply unit 1 can adopt a diesel engine, a small hydroelectric set, a 0.4kV power distribution network and/or a 27.5kV high-voltage power grid according to the actual environment, in addition to the distributed wind turbine generator 11, the distributed photovoltaic set 12 and the fuel cell set 13. The fuel battery pack 13, the diesel engine, the small hydroelectric power pack, the 0.4kV power distribution network and/or the 27.5kV high-voltage power grid and the like are/is used as a third power supply.
The hybrid energy storage unit 2 comprises n sets of capacity type energy storage devices 2a and m sets of power type energy storage devices 2b, wherein the capacity type energy storage devices 2a comprise n sets of flow batteries 21, and the flow batteries 21 can be all-vanadium flow batteries, zinc-bromine flow batteries or iron-chromium flow batteries. Each set of capacity type energy storage equipment 2a comprises two sets of flow batteries 21, two sets of bidirectional DC-DC converters 22, two DC/AC converters 23(PCS) and a single-phase split traction transformer 24 (single-phase double-classification traction transformer). The flow batteries 21 are of a two-stage connection type structure, as shown in fig. 2, each standardized flow battery 21 is correspondingly provided with one bidirectional DC-DC converter 22, every two bidirectional DC-DC converters 22 are connected with one DC/AC converter 23(PCS), and the low-voltage side of each DC/AC converter 23 realizes the exchange of energy with a 27.5kV single-phase alternating current bus through a low-voltage winding of a single-phase split traction transformer 24. Because the direct-current voltage of the flow battery 21 is low, the adoption of a double-stage connection structure is convenient for the selection of equipment such as an alternating-current low-voltage side switch and the like, the comprehensive efficiency of the converter is improved, and the practical engineering application is optimized.
The power type energy storage device 2b may employ a lithium battery/super capacitor 25, which may employ a lithium carbonate battery, a lithium iron phosphate battery, or a lithium manganate battery. Because the lithium battery/super capacitor 25 has a high direct-current voltage, the lithium battery/super capacitor 25 adopts a single-stage structure, and each set of power type energy storage equipment 2b comprises 2 sets of lithium battery/super capacitor 25, 2 sets of DC/ AC converters 23 and 1 set of single-phase split traction transformer 24. The lithium battery/super capacitor 25 is connected with the DC/AC converters 23(PCS), and the low-voltage side of each DC/AC converter 23 realizes the exchange of energy with the 27.5kV single-phase alternating current bus through the low-voltage winding of the single-phase split traction transformer 24.
Electrochemical energy storage has the advantages of high response speed, flexible and convenient arrangement, short construction period, mature industrial chain matching and the like, and is widely applied to engineering, and different types of batteries have unique characteristics. The flow battery has the advantages of long cycle life, flexible capacity configuration, high safety and the like, and the lithium ion battery/super capacitor has the advantages of large charge-discharge power, good low-temperature characteristic, low cost and the like. The two energy storage devices are cooperatively matched, so that high-power and long-time charging and discharging of the hybrid energy storage unit can be realized, and the service life of the hybrid energy storage unit is optimized. The technologies of clean generator sets such as wind turbine generators, photovoltaics and fuel cells tend to be mature, and the successful operation experience of the project is rich. The utility model utilizes the hybrid energy storage unit to block the direct connection between the traction network and the power grid, realizes the loose coupling between the power grid and the traction network, and eliminates the electric energy quality influences of negative sequence, harmonic wave, power factor and the like brought to the high-voltage power grid by the existing traction power supply system; the hybrid energy storage unit is adopted to collect clean electric energy such as wind, light and the like, so that economic construction and clean power supply of the traction power supply system of the electrified railway in a weak grid area or even a grid-free area are realized, a plurality of adverse effects of the conventional traction power supply system to the power grid and the traction network of the electrified railway are solved, and the green development of the railway in China is led.
Example 2
In this embodiment, a three-phase traction power supply system with a common dc bus structure is adopted for a power supply unit 1, and the traction power supply system for an electrified railway based on hybrid energy storage includes, as shown in fig. 3, a power supply unit 1, a hybrid energy storage unit 2, and a traction network unit 3. The power supply unit 1 charges the hybrid energy storage unit 2, and the hybrid energy storage unit 2 supplies power to the traction network unit 3 through a three-phase alternating current bus.
The power supply unit 1 is multi-source heterogeneous and comprises n distributed wind turbine generators 11, n distributed photovoltaic sets 12 and n fuel cell sets 13, wherein the fuel cell sets 13 are connected with hydrogen production equipment 14, and electric energy is generated through the hydrogen production equipment 14. The n distributed wind power generation sets 11, the n sets of distributed photovoltaic sets 12 and the n sets of fuel cell sets 13 form a direct-current micro-grid structure to cooperatively charge the hybrid energy storage unit 2. The power supply unit 1 can adopt a diesel engine, a small hydroelectric set, a 0.4kV power distribution network and/or a 27.5kV high-voltage power grid according to the actual environment, in addition to the distributed wind turbine generator 11, the distributed photovoltaic set 12 and the fuel cell set 13. The fuel battery pack 13, the diesel engine, the small hydroelectric power pack, the 0.4kV power distribution network and/or the 27.5kV high-voltage power grid and the like are/is used as a third power supply.
The hybrid energy storage unit 2 comprises n sets of capacity type energy storage devices 2a and m sets of power type energy storage devices 2b, wherein the capacity type energy storage devices 2a comprise n sets of flow batteries 21, and the flow batteries 21 can be all-vanadium flow batteries, zinc-bromine flow batteries or iron-chromium flow batteries. Each set of capacity type energy storage device 2a includes two sets of flow batteries 21, two sets of bidirectional DC-DC converters 22, two DC/AC converters 23(PCS), and one three-phase split traction transformer 26 (three-phase double-classification traction transformer). The flow batteries 21 are of a two-stage connection type structure, as shown in fig. 2, each standardized flow battery 21 is correspondingly provided with one bidirectional DC-DC converter 22, every two bidirectional DC-DC converters 22 are connected with one DC/AC converter 23(PCS), and the low-voltage side of each DC/AC converter 23 realizes the exchange of energy with a 27.5kV three-phase alternating-current bus through a low-voltage winding of a three-phase split traction transformer 26. Because the direct-current voltage of the flow battery 21 is low, the adoption of a double-stage connection structure is convenient for the selection of equipment such as an alternating-current low-voltage side switch and the like, the comprehensive efficiency of the converter is improved, and the practical engineering application is optimized.
The power type energy storage device 2b may employ a lithium battery/super capacitor 25, which may employ a lithium carbonate battery, a lithium iron phosphate battery, or a lithium manganate battery. Because the lithium battery/super capacitor 25 has a high direct-current voltage, the lithium battery/super capacitor 25 adopts a single-stage structure, and each set of power type energy storage device 2b comprises 2 sets of lithium battery/super capacitor 25, 2 sets of DC/ AC converters 23 and 1 set of three-phase split traction transformer 26. The lithium battery/super capacitor 25 is connected with the DC/AC converters 23(PCS), and the low-voltage side of each DC/AC converter 23 realizes the exchange of energy with the 27.5kV three-phase alternating current bus through the low-voltage winding of the three-phase split traction transformer 26.
Example 3
In this embodiment, a three-phase traction power supply system with a common ac bus structure is adopted for a power supply unit 1, and an electrified railway traction power supply system based on hybrid energy storage, as shown in fig. 4, includes a power supply unit 1, a hybrid energy storage unit 2, and a traction network unit 3. The power supply unit 1 charges the hybrid energy storage unit 2, and the hybrid energy storage unit 2 supplies power to the traction network unit 3 through a three-phase alternating current bus.
The power supply unit 1 is multi-source heterogeneous and comprises n distributed wind turbine generators 11, n distributed photovoltaic sets 12 and n fuel cell sets 13, wherein the fuel cell sets 13 are connected with hydrogen production equipment 14, and electric energy is generated through the hydrogen production equipment 14. The n distributed wind power generation sets 11, the n sets of distributed photovoltaic sets 12 and the n sets of fuel cell sets 13 form an alternating current micro-grid structure to cooperatively charge the hybrid energy storage unit 2. The low-voltage alternating current output by the power supply unit 1 is boosted to 27.5kV through the step-up transformer 4, and the hybrid energy storage unit is charged through a 27.5kV three-phase alternating current bus.
The power supply unit 1 can adopt a diesel engine, a small hydroelectric set, a 0.4kV power distribution network and/or a 27.5kV high-voltage power grid according to the actual environment, in addition to the distributed wind turbine generator 11, the distributed photovoltaic set 12 and the fuel cell set 13. The fuel battery pack 13, the diesel engine, the small hydroelectric power pack, the 0.4kV power distribution network and/or the 27.5kV high-voltage power grid and the like are/is used as a third power supply.
The hybrid energy storage unit 2 comprises n sets of capacity type energy storage devices 2a and m sets of power type energy storage devices 2b, wherein the capacity type energy storage devices 2a comprise n sets of flow batteries 21, and the flow batteries 21 can be all-vanadium flow batteries, zinc-bromine flow batteries or iron-chromium flow batteries. Each set of capacity type energy storage device 2a includes two sets of flow batteries 21, two sets of bidirectional DC-DC converters 22, two DC/AC converters 23(PCS), and one three-phase split traction transformer 26 (three-phase double-classification traction transformer). The flow batteries 21 are of a two-stage connection type structure, as shown in fig. 2, each standardized flow battery 21 is correspondingly provided with one bidirectional DC-DC converter 22, every two bidirectional DC-DC converters 22 are connected with one DC/AC converter 23(PCS), and the low-voltage side of each DC/AC converter 23 realizes the exchange of energy with a 27.5kV three-phase alternating-current bus through a low-voltage winding of a three-phase split traction transformer 26. Because the direct-current voltage of the flow battery 21 is low, the adoption of a double-stage connection structure is convenient for the selection of equipment such as an alternating-current low-voltage side switch and the like, the comprehensive efficiency of the converter is improved, and the practical engineering application is optimized.
The power type energy storage device 2b may employ a lithium battery/super capacitor 25, which may employ a lithium carbonate battery, a lithium iron phosphate battery, or a lithium manganate battery. Because the lithium battery/super capacitor 25 has a high direct-current voltage, the lithium battery/super capacitor 25 adopts a single-stage structure, and each set of power type energy storage device 2b comprises 2 sets of lithium battery/super capacitor 25, 2 sets of DC/ AC converters 23 and 1 set of three-phase split traction transformer 26. The lithium battery/super capacitor 25 is connected with the DC/AC converters 23(PCS), and the low-voltage side of each DC/AC converter 23 realizes the exchange of energy with the 27.5kV three-phase alternating current bus through the low-voltage winding of the three-phase split traction transformer 26.
Electrified railway pulls power supply system based on mix energy storage, has broken away from the transition dependence to high voltage electric network, can be according to the natural endowment and other convenient power such as the scene of electrified railway construction ground, the nimble energy supply system that constitutes utilizes energy storage "assemble all the time, release as required" energy migration technical characteristic, realize that the power supply of pulling under the weak rack even does not have the rack is safe, reliable, continuous, solve current electrified railway and pull a great deal of unfavorable problem of power supply system simultaneously. According to the operation state of the hybrid energy storage unit, the traction power supply system can be divided into 3 operation conditions:
(1) storage discharge mode (on demand). When the master control monitors that the power supply arm has the locomotive to pass through and is in a traction state, the plurality of energy storage devices cooperatively output power (if a power distribution network or a high-voltage power grid exists in a power supply system, the power supply arm is disconnected with a connected switch at the moment, the influence on the power quality of the power grid is avoided, and the wind power, photovoltaic or fuel cell and other devices can continuously charge the stored energy), so that the power utilization requirement of the electric locomotive is met.
(2) Energy storage charging mode (full time). When the master control system monitors that the power supply arm inorganic vehicle passes through or runs in an idle state, each power supply of the power supply unit is charged in a low-current equalizing mode for the hybrid energy storage unit; when the master control system monitors that the power supply arm locomotive operates in a braking state, each power supply of the power supply unit (for example, the power supply system comprises a power distribution network or a high-voltage power grid, a connecting switch is disconnected, the power supply unit is in a hot standby state, and the hybrid energy storage unit is not charged) performs low-current equalizing charging on the hybrid energy storage unit, and meanwhile, the hybrid energy storage unit recovers braking energy of the electric locomotive.
(3) Energy storage assisted service mode (according to plan). When the power supply unit component contains a power distribution network or a high-voltage power grid and the power grid needs auxiliary services such as peak regulation, frequency modulation and voltage regulation, the hybrid energy storage unit can intelligently interact with the power grid according to a planned output curve given by the power grid on the premise of meeting the power supply requirement of the locomotive by the traction power supply system, so that the auxiliary services are provided for the power grid.
Electric railway pulls power supply system based on mix energy storage, have following advantage:
benefits to the railroad side
(1) The traditional power supply mode of the traction system of the electrified railway is overturned, the technical characteristics of energy time migration of full-time convergence and on-demand release of various abnormal power supplies (multi-source isomerism) by the hybrid energy storage unit are utilized according to natural endowments of wind, light, water and the like in different areas and power grid architectures, the power supply scheme of the traction power supply system is designed in a customized mode, and the economic construction of the electric iron traction power supply system in the area with weak power grid or even without the power grid is realized.
(2) The power type and the energy storage type are widely selected and freely combined, the self-consistency of the energy supply of the electrified railway system can be realized by utilizing natural endowments such as wind, light and water on the spot and the configuration of the electric net rack is intensive and simplified, and the flexibility of the construction of the electrified railway is improved.
(3) The traction power supply system is decentralized in arrangement, unitized in equipment and centralized in control, the configuration redundancy of the power supply unit and the hybrid energy storage unit is high, and the continuity, reliability and safety of traction power supply are high.
(4) The electric composition structure of the traction power supply system is flexible and various. Various special-shaped power supplies can be built into a direct current/alternating current micro-grid to charge the hybrid energy storage system, the hybrid energy storage unit can adopt a single-phase/three-phase traction power supply system to support the locomotive/motor train unit to normally operate, and a traction power supply system structure can be built according to the requirement in the specific practical engineering.
(5) The method can realize the clean promotion of high-speed rail, promotes the fusion development of new energy/renewable energy and railways, improves the continuous stability of a traction power supply system and the adaptability to energy supply conditions and environment, perfects the technical system of the electrified railways in China, leads the green development of the electrified railways, and provides a feasible solution for the construction and operation of the electrified railways in weak power grids and even non-network areas.
Second, benefits to the grid side
(1) The direct connection between the traction network and the power grid is blocked by utilizing the stored energy, the loose coupling between the power grid and the traction network is realized, and the electric energy quality influences of negative sequence, harmonic wave, power factors and the like brought to the high-voltage power grid by the conventional traction power supply system are eliminated.
(2) The construction of 220kV high-voltage transmission lines and high-voltage traction substations is not needed, secondary electrical equipment related to the high-voltage transmission lines and the high-voltage traction substations is reduced, the land acquisition area is reduced, the construction cost is greatly reduced, the construction period is shortened, and the later operation and maintenance cost is reduced.
(3) The traction power supply system has the functions of a traction substation and an energy storage power station, realizes the function of combining the traction substation and the energy storage power station, can meet the power utilization requirement of a locomotive, can provide auxiliary services such as peak regulation, frequency regulation, voltage regulation and the like for a power grid, improves the regulation margin of the power grid, and promotes the construction of high-proportion clean energy of the power grid.
(4) The capacity of a power supply monomer in the traction power supply system is small, the multi-type special-shaped power supply is in real time collaborative small-current equalizing charging of the hybrid energy storage unit (beneficial to prolonging the service life of the energy storage system and improving the utilization rate of a transformer), the hybrid energy storage unit collects electric energy of various power supplies, the electric energy is released in a centralized manner when the locomotive runs in a traction state, the power supply of high-power and impact locomotive loads is met, and the safe and reliable continuous power supply of the high-power and intermittent loads by using a small power supply is realized.
(5) The hybrid energy storage unit can be used as an emergency power supply of an electric railway traction power supply system and can also be used as a black start power supply of a power grid.
(6) The traction power supply system is green and clean in power supply and environment-friendly, and the proportion of clean energy power generation is improved.
(7) The traction power supply system can realize the electrical optimization coordination configuration of a wind power generation unit, a photovoltaic power generation unit, other power generation units (comprising a fuel cell/diesel engine/power grid), the power and the capacity of a hybrid energy storage unit, improves the utilization rate of each power supply unit and the hybrid energy storage unit on the premise of ensuring the power supply reliability and the safety of the traction power supply system, and greatly reduces the investment of system equipment and the later operation and maintenance cost.
(8) The traction power supply system realizes the technical advantage complementation and the optimized matching of electrical parameters of the redox flow battery and the super capacitor/lithium ion battery. The flow battery bears the basic load of the locomotive/motor train unit, the super capacitor/lithium ion battery can stabilize the power difference between the locomotive/motor train unit and the flow battery in real time, the complementary configuration avoids frequent deep discharge of the flow battery, ensures the operation life of the flow battery, further ensures the operation life of the hybrid energy storage unit, avoids excessive redundant configuration of the hybrid energy storage unit, and reduces investment cost and operation and maintenance investment. In specific practical engineering, other capacity type energy storage and power type energy storage can be used for replacing a flow battery and a super capacitor/lithium ion battery respectively.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (7)
1. Electrified railway pulls power supply system based on mix energy storage, its characterized in that: the system comprises a power supply unit, a hybrid energy storage unit and a traction net unit; the hybrid energy storage unit comprises a capacity type energy storage device and a power type energy storage device, wherein the capacity type energy storage device comprises a flow battery, and the flow battery adopts a duplex structure and converts direct current into alternating current; the power type energy storage equipment adopts a lithium battery and a super capacitor, the power supply unit charges the hybrid energy storage unit, and the hybrid energy storage unit supplies power to the traction network unit through a single-phase/three-phase alternating current bus.
2. The hybrid energy storage based electrified railroad traction power supply system of claim 1, wherein: the flow battery adopts a duplex structure, and specifically comprises the following steps: each standardized flow battery is correspondingly provided with one bidirectional DC-DC converter, every two bidirectional DC-DC converters are connected with one DC/AC converter, and the low-voltage side of each DC/AC converter realizes the exchange of energy with a 27.5kV single-phase/three-phase alternating current bus through a split traction transformer low-voltage winding.
3. The hybrid energy storage based electrified railroad traction power supply system of claim 1, wherein: the lithium battery and the super capacitor are connected with the DC/AC converters, and the low-voltage side of each DC/AC converter realizes the exchange of energy with the 27.5kV single-phase/three-phase alternating-current bus through the low-voltage winding of the split traction transformer.
4. The hybrid energy storage based electrified railroad traction power supply system of claim 1, wherein: the power supply unit at least comprises one of a distributed wind turbine generator and a distributed photovoltaic generator; the wind-powered wind power generation set and the distributed photovoltaic set form a direct-current micro-grid or an alternating-current micro-grid to charge the hybrid energy storage unit in a cooperative manner.
5. The hybrid energy storage based electrified railroad traction power supply system of claim 4, wherein: the power supply unit further comprises a third power supply, the third power supply comprises a fuel battery pack, a diesel engine, a small hydroelectric pack, a 0.4kV power distribution network and/or a 27.5kV high-voltage power grid, and the fuel battery pack is connected with the hydrogen production equipment and generates electric energy through the hydrogen production equipment.
6. The hybrid energy storage based electrified railroad traction power supply system of claim 5, wherein: when the wind-powered wind generator set, the distributed photovoltaic set and the third power supply form an alternating-current micro-grid, the traction power supply system of the electrified railway further comprises a step-up transformer, wherein low-voltage alternating current output by the power supply unit is stepped up to 27.5kV, and the hybrid energy storage unit is charged through a 27.5kV three-phase alternating-current bus.
7. The hybrid energy storage based electrified railroad traction power supply system of claim 1, wherein: the flow battery comprises an all-vanadium flow battery, a zinc-bromine flow battery or an iron-chromium flow battery; the lithium battery comprises a lithium carbonate battery, a lithium iron phosphate battery or a lithium manganate battery.
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| CN201922483091.XU CN211335659U (en) | 2019-12-31 | 2019-12-31 | Electrified railway traction power supply system based on hybrid energy storage |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111016742A (en) * | 2019-12-31 | 2020-04-17 | 青海能高新能源有限公司 | Electrified railway traction power supply system and method based on hybrid energy storage |
| CN113492733A (en) * | 2021-09-08 | 2021-10-12 | 西南交通大学 | Traction network distributed power generation and supply system and control method |
| CN113492732A (en) * | 2021-09-08 | 2021-10-12 | 西南交通大学 | AT traction network distributed power generation and supply system and control method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111016742A (en) * | 2019-12-31 | 2020-04-17 | 青海能高新能源有限公司 | Electrified railway traction power supply system and method based on hybrid energy storage |
| CN111016742B (en) * | 2019-12-31 | 2024-05-10 | 青海能高新能源有限公司 | Electrified railway traction power supply system and method based on hybrid energy storage |
| CN113492733A (en) * | 2021-09-08 | 2021-10-12 | 西南交通大学 | Traction network distributed power generation and supply system and control method |
| CN113492732A (en) * | 2021-09-08 | 2021-10-12 | 西南交通大学 | AT traction network distributed power generation and supply system and control method |
| WO2023035540A1 (en) * | 2021-09-08 | 2023-03-16 | 西南交通大学 | Distributed-type power generation and power supply system for traction network, and control method |
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